Good on ya Pengo, rightly or wrongly, you are at least trying to having a go, which is more than I can say for those who enjoy the past time of trying to demean people in front of others, just to be mean, with zero positive input to take its place.
Any one can throw hand grenades from a distance & offer nothing in its place.
It's this type of behaviour that has driven people from making some postings to none.

Back to business.
Heres a method that has good SR.

.Target the 1st & 2nd Betfair Favs
.Target Jockeys with a 15% & worse SR at that track.
.Target Trainers with a 15% & worse SR at that track.

The selection must have a trainer & jockey with the above stats.

One will find a lot that fall over a lot.
Bet 1% of bank if priced $1-3.50
Bet .6% of bank if priced $3.55-7.40

No bet if selection is $7.50+

Cheers.

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Cheers.